6. Eric Harris & Dylan Klebold
The shooting at Columbine High School in Columbine, Colorado on April 20, 1999 was described as the deadliest school shootings in U.S history at the time. Students Eric Harris and Dylan Klebold planted a bomb intended to go off in the cafeteria killing hundreds of students, but the bomb failed to detonate. Instead Harris and Klebold entered the school and shot 33 people, killing 13 of them. Then they both committed suicide in the library. There were reports that both Harris and Klebold were bullied and the attack was their revenge. Investigations later determined that Harris was the mastermind and likely a psychopath motivated by sadism and Klebold suffered from depression and was motivated by a desire for revenge.
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